First commissioning of the HLS-II storage ring

TL;DR

The paper reports on the successful commissioning of HLS-II, a synchrotron light source upgrade, achieving key performance goals such as low emittance, multiple insertion devices, and precise orbit control, enhancing its competitiveness.

Contribution

It presents the first commissioning results of HLS-II, demonstrating achievement of design goals and improvements over previous versions of the light source.

Findings

Natural emittance below 40 nm-rad at 800 MeV

Installation of five insertion devices

Closed orbit rms jitter below 4 μm

Abstract

To meet the increasing requirements of synchrotron radiation users, the upgrade project to enhance the performance of Hefei Light Source (HLS), named HLS-II, was launched in 2010, and in 2014 the first commissioning of HLS-II was successfully completed. After the commissioning, the main design goals for the HLS-II storage ring have been achieved, with natural emittance of electron beam lower than 40 nm-rad at 800 MeV, five insertion devices installed in straight sections and root mean square (rms) jitter of closed orbit smaller than 4 {\mu}m, making HLS-II at a higher level among the same class of machines in the world. This paper reports on the results of the commissioning of the HLS-II storage ring, which includes linear optics correction, compensation of insertion devices effect and closed orbit feedback.